--- a/hotspot/src/share/vm/gc/g1/g1CollectorPolicy.hpp	Mon Oct 19 15:47:36 2015 +0200
+++ b/hotspot/src/share/vm/gc/g1/g1CollectorPolicy.hpp	Thu Nov 12 14:03:14 2015 +0100
@@ -272,7 +272,7 @@
   size_t _pending_cards;
 
 public:
-  G1Predictions& predictor() { return _predictor; }
+  const G1Predictions& predictor() const { return _predictor; }
 
   // Accessors